The solid black is like swimsuit material. It was smooth and very comfortable to wear. It's a size L, but it runs small, feeling more like a size M. The side-line pants have signs of wear and are made of a material that easily attracts lint. The waist is adjustable, and I loved them. The shorts had elastic at the waist, so I could wear them even when my stomach got bigger! They are a size S, but could also fit a size M.